Canadian Cities

U.S. Cities

International Cities

Glossary

P.O.P. stands for "Probability of Precipitation." It does not predict when, where or how much precipitation will occur. When a weather service issues a forecast calling for rain, it is usually followed by a probability.

For example: "P.O.P. 60%." This expression means there is a 60% chance that any random place in the forecast area, such as your home, will receive measurable rainfall. Measurable rainfall means at least 0.2 mm of rain or the water equivalent of snow.